EP1111834A2 - Allocation et génération de séquences de saut de fréquence, dans des systèmes multiporteuses à étalement de spectre - Google Patents

Allocation et génération de séquences de saut de fréquence, dans des systèmes multiporteuses à étalement de spectre Download PDF

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Publication number
EP1111834A2
EP1111834A2 EP00311073A EP00311073A EP1111834A2 EP 1111834 A2 EP1111834 A2 EP 1111834A2 EP 00311073 A EP00311073 A EP 00311073A EP 00311073 A EP00311073 A EP 00311073A EP 1111834 A2 EP1111834 A2 EP 1111834A2
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EP
European Patent Office
Prior art keywords
sequences
sequence
generated
latin
time slot
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP00311073A
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German (de)
English (en)
Other versions
EP1111834B1 (fr
EP1111834A3 (fr
Inventor
Rajiv Laroia
Junyi Li
Sathyadev Venkata Uppala
Sundeep Rangan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qualcomm Inc
Original Assignee
Lucent Technologies Inc
Flarion Technologies Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lucent Technologies Inc, Flarion Technologies Inc filed Critical Lucent Technologies Inc
Priority to EP10012078A priority Critical patent/EP2271023B1/fr
Priority to EP09001515A priority patent/EP2048809B1/fr
Publication of EP1111834A2 publication Critical patent/EP1111834A2/fr
Publication of EP1111834A3 publication Critical patent/EP1111834A3/fr
Application granted granted Critical
Publication of EP1111834B1 publication Critical patent/EP1111834B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/02—Channels characterised by the type of signal
    • H04L5/023—Multiplexing of multicarrier modulation signals
    • H04L5/026—Multiplexing of multicarrier modulation signals using code division
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/7143—Arrangements for generation of hop patterns
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/7136—Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform

Definitions

  • This invention relates to communications systems and, more particularly, to wireless and other communications systems employing Orthogonal Frequency Division Multiplexing based Spread Spectrum Multiple Access.
  • Wireless communications systems are typically shared media systems, i.e., there is a fixed available bandwidth that is shared by all users of the wireless system.
  • Such wireless communications systems are often implemented as so-called "cellular" communications systems, in which the territory being covered is divided into separate cells, and each cell is served by a base station.
  • Brajal et al. arrangement is a general wide-band orthogonal frequency division multiplexing (OFDM) based spread spectrum multiple access employed in a wireless communications systems.
  • OFDM orthogonal frequency division multiplexing
  • the Brajal et al. arrangement is not optimized for use in a cellular communications system, and fails to show, teach or suggest how to optimize frequency hopping patterns, tone assignment or bandwidth reuse.
  • the wireless cellular communications system disclosed in the Laroia et al. application operates satisfactorily in many applications, it is limited in that it is directed toward using a specific frequency hopping sequence. Consequently, interference may not be minimized, and in data communications applications quality of service is not optimized.
  • sequence generator and sequence assignor in combination with a user tone assignor are employed to generate and assign tone sequences to a user on a time slot by time slot basis.
  • sequence generator and sequence assignor in combination with a user tone identifier are employed to generate sequences and to identify incoming tone sequences to a user on a time slot by time slot basis in accordance with sequences assigned by the sequence assignor.
  • the sequence assignment in a time slot is such that a prescribed plurality of sequences is assigned to a particular user.
  • This partitioning of the tasks facilitates the use of a sequence generator that generates sequences with the desirable properties of interference and frequency diversity and, which, leaves the task of properly assigning these sequences among one or more users to the sequence assignor.
  • the sequence assignor functions in such a manner that the interference and frequency diversity properties for the one or more users are preserved, and this is further facilitated by assigning sequences in such a manner that they maximally overlap prior assigned sequences.
  • a Latin square based sequence is generated in accordance with a first prescribed process.
  • a Latin cube based sequence is generated in accordance with a second prescribed process.
  • a Latin hypercube of prescribed dimension based sequence is generated in accordance with a third prescribed process.
  • the principles of the invention are employed to realize frequency band hopping.
  • FIG. I illustrates a frequency domain representation in which a prescribed plurality of tones is generated in a prescribed bandwidth.
  • the energy from each tone is strictly confined to a narrow bandwidth centered around the tone frequency, whereas in an OFDM system that is a wide band system the energy at a particular tone is allowed to leak into the entire bandwidth W , but it is so arranged that the tones do not interfere with one another.
  • FIG. 2 illustrates a time domain representation of tone ⁇ i within symbol period T. Again, note that within each symbol period T, data may be transmitted on each of the tones substantially simultaneously.
  • FIG. 3 shows, in simplified block diagram form, details of an OFDM transmitter 300 including an embodiment of the invention. Specifically, shown are sequence generator 301, sequence assignor 302, user tone assignor 303 and user bits to waveform mapper 304. User bits b i are supplied via input terminal 305 to user bits and waveform mapper 304 where they are mapped using tones ⁇ ⁇ 1 ,... ⁇ i ,... ⁇ m ⁇ , into a waveform represented by ⁇ c i e j 2 ⁇ i t , which is supplied to antenna 306 for transmission.
  • a Latin Cube sequence is generated by where p , a and s i are integers, p is a prime number or a power of a prime number, is the largest integer less than k / p , k is a dwell time interval index, and the periodicity of the Latin Cube sequence is p 2 .
  • a Latin Hypercube for example, of dimension L, is generated by where p , a and s i are integers, p is a prime number or a power of a prime number, is the largest integer less than k / p l -1 , k is a dwell time interval index, and the periodicity of the Latin Hypercube sequence is p l -1 .
  • the generated sequence S i is supplied as an input to user tone assignor 303.
  • Sequence assignor 302 assigns sequences to a user for the duration of a time slot, namely, T SLOT .
  • T SLOT includes d dwell time intervals, each having duration T d , and each dwell interval includes y symbols each of duration T .
  • T d y ⁇ T
  • T SLOT d ⁇ T d .
  • T SLOT includes dwell time interval k through k+d-1 , where k is the dwell time interval index.
  • Each dwell time interval could include one or more prescribed tones. Further, note that the tones of different users do not collide in a cell. This is clearly illustrated in FIG. 5, which graphically illustrates the assignment of tone sequences and in FIG. 6, which graphically illustrates the sequence assignment for a time slot.
  • tones assigned to a first user are shown in solid outline and denoted m 1
  • tones assigned to a second user are shown in dashed outline and denoted m 2
  • a number of the tones assigned to the first user are identified, namely, ⁇ s i / k , ⁇ s i / k +1, and ⁇ s i / k +2.
  • FIG. 7 graphically illustrates the sequence assignments for a plurality of time slots.
  • the current sequence assignment is such as to maximally overlap with prior sequence assignments.
  • This arrangement facilitates good interference and frequency diversity for the one or more users.
  • other criteria such as the distance of the users from the base station to serve as a tie breaker.
  • the users further away from the current base station being given preference in the assignment with the view that they are more likely to cause more interference to signals in the neighboring base stations than users close to the current base station.
  • sequence assignment output from sequence assignor 302 is supplied as another input to user tone assignor 303.
  • User tone assignor 303 is responsive to the supplied outputs from sequence generator 301 and sequence assignor 302 to generate the sequence of tones for the particular user, namely, tones ⁇ ⁇ 1 ,... ⁇ i ,... ⁇ m ⁇ . Tones ⁇ ⁇ 1 ,... ⁇ i ,... ⁇ m ⁇ are supplied to user bits to waveform mapper 304 where they are employed to modulate the users bits b i to generate an output waveform, namely, ⁇ c i e j 2 ⁇ i t . Note that c i may result from, for example, error correction encoding or bit modulation of user bits b i . Such encoders and modulators are well known in the art and are considered a part of user bits to waveform mapper 304.
  • Waveform ⁇ c i e j 2 ⁇ i t is supplied to antenna 306 for transmission as desired.
  • FIG. 8 illustrates frequency hopping in a multicell environment in which an embodiment of the invention is advantageously employed. Note that each cell is assigned a different constant " a ", where constant a defines a family of sequences and is employed in the generation of the particular family of sequences, as described above for the Latin Square, Latin Cube and Latin Hypercube sequences.
  • FIG. 4 shows, in simplified block diagram form, details of a receiver 400 including an embodiment of the invention. Elements of receiver 400 that are essentially identical in construction and functionality to those elements shown in FIG. 3, and described above, will not be described again in detail. Accordingly, user tone identifier 401 is responsive to the supplied outputs from sequence generator 301 and sequence assignor 302, as described above, to generate the sequence of tones for the particular user, namely, tones ⁇ ⁇ 1 ,... ⁇ i ,... ⁇ m ⁇ . Tones ⁇ ⁇ 1 ,... ⁇ i ,...
  • ⁇ m ⁇ are supplied to waveform to user bits mapper 402, where they are employed to demodulate the waveform received via antenna 403, namely, ⁇ c i e j 2 ⁇ i t , in order to obtain user bits b i . Then, user bits b i are supplied as an output to be used as desired.
  • c i may result from, for example, error correction encoding or bit modulation of user bits b i in a remote transmitter. Therefore, c i must be accordingly decoded using an error correction decoder or demodulated using a bit demodulator. Again, such decoders and demodulators are well known in the art and are considered a part of waveform to user bits mapper 402.
  • transmitter 300 and receiver 400 form a transceiver for use in a frequency hopping OFDM multiple access wireless system, either in mobile units or at base stations.
  • FIG. 9 shows, in simplified block diagram form, details of transmitter 900 that may advantageously employ an embodiment of the invention in a band hopping application.
  • transmitter 900 which are essentially identical in construction and functionality as those shown in FIG. 3 for transmitter 300 have been similarly numbered and will not be described again in detail.
  • band hopper 902 to drive sequence generator 901 through, in this example, frequency bands B 0 , B 1 and B 2 , namely, B ⁇ 0 , 1 , 2 ⁇ , as shown in FIG. 11, and the sequence generation processes.
  • each band includes p tones and that the bandwidth for a cell is W c .
  • sequence generator 901 generates the tone sequence in accordance with one of several processes.
  • a Latin Cube sequence is generated by where p , a and s i are integers, p is a prime number or a power of a prime number, B is the frequency band, is the largest integer less than k / p , k is a dwell time interval index, and the periodicity of the Latin Cube sequence is p 2 .
  • a Latin Hypercube for example, of dimension L, is generated by where p , a and s i are integers, p is a prime number or a power of a prime number, B is the frequency band, is the largest integer less than k / p l -1 , k is a dwell time interval index, and the periodicity of the Latin Hypercube sequence is p l- 1 .
  • FIG. 10 shows, in simplified block diagram form, details of receiver 1000 that may advantageously employ an embodiment of the invention in a band hopping application.
  • the elements of receiver 1000 which are essentially identical in construction and functionality as those shown in FIG. 4 for receiver 400 have been similarly numbered and will not be described again in detail.
  • the only differences between receivers 400 and 1000 are in use of band hopper 902 to drive sequence generator 901 through, in this example, frequency bands B 0 , B 1 and B 2 , namely, B ⁇ 0,1,2 ⁇ , as shown in FIG. 11, and the sequence generation processes.
  • Band hopper 902 and sequence generator 901 are identical in construction and functionality as those shown in FIG. 9 and described above.
  • FIG. 12 illustrates an instant of a band hopping cellular system.
  • the frequency bands in cell a 1 are such that frequency bands B 0 , B 1 and B 2 become B 1 , B 2 and B 0 , respectively.
  • the frequency bands rotate such that frequency bands B 0 , B 1 and B 2 become B 1 , B 2 and B 0 , respectively. Consequently, there is no collision of frequency bands in the cell neighborhood.
  • transmitter 900 and receiver 1000 form a transceiver for use in a band hopping OFDM multiple access wireless system, either in mobile units or in base stations.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Stereo-Broadcasting Methods (AREA)
EP00311073A 1999-12-23 2000-12-12 Allocation et génération de séquences de saut de fréquence, dans des systèmes multiporteuses à étalement de spectre Expired - Lifetime EP1111834B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP10012078A EP2271023B1 (fr) 1999-12-23 2000-12-12 Allocation et génération de séquences de saut de fréquence, dans des systèmes à spectre étalé.
EP09001515A EP2048809B1 (fr) 1999-12-23 2000-12-12 Allocation et génération de séquences de saut de fréquence dans des systèmes à spectre étalé

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US472074 1983-03-04
US09/472,074 US6553019B1 (en) 1999-12-23 1999-12-23 Communications system employing orthogonal frequency division multiplexing based spread sprectrum multiple access

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP09001515A Division EP2048809B1 (fr) 1999-12-23 2000-12-12 Allocation et génération de séquences de saut de fréquence dans des systèmes à spectre étalé

Publications (3)

Publication Number Publication Date
EP1111834A2 true EP1111834A2 (fr) 2001-06-27
EP1111834A3 EP1111834A3 (fr) 2006-02-22
EP1111834B1 EP1111834B1 (fr) 2009-04-15

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EP00311073A Expired - Lifetime EP1111834B1 (fr) 1999-12-23 2000-12-12 Allocation et génération de séquences de saut de fréquence, dans des systèmes multiporteuses à étalement de spectre
EP10012078A Expired - Lifetime EP2271023B1 (fr) 1999-12-23 2000-12-12 Allocation et génération de séquences de saut de fréquence, dans des systèmes à spectre étalé.
EP09001515A Expired - Lifetime EP2048809B1 (fr) 1999-12-23 2000-12-12 Allocation et génération de séquences de saut de fréquence dans des systèmes à spectre étalé

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EP10012078A Expired - Lifetime EP2271023B1 (fr) 1999-12-23 2000-12-12 Allocation et génération de séquences de saut de fréquence, dans des systèmes à spectre étalé.
EP09001515A Expired - Lifetime EP2048809B1 (fr) 1999-12-23 2000-12-12 Allocation et génération de séquences de saut de fréquence dans des systèmes à spectre étalé

Country Status (11)

Country Link
US (1) US6553019B1 (fr)
EP (3) EP1111834B1 (fr)
JP (1) JP4593767B2 (fr)
KR (1) KR100804920B1 (fr)
CN (1) CN1301089B (fr)
AT (2) ATE515851T1 (fr)
AU (1) AU772662B2 (fr)
BR (1) BRPI0006806B1 (fr)
CA (1) CA2327980C (fr)
DE (1) DE60042007D1 (fr)
ES (3) ES2366143T3 (fr)

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US7363039B2 (en) 2002-08-08 2008-04-22 Qualcomm Incorporated Method of creating and utilizing diversity in multiple carrier communication system
US6961595B2 (en) * 2002-08-08 2005-11-01 Flarion Technologies, Inc. Methods and apparatus for operating mobile nodes in multiple states
US8190163B2 (en) * 2002-08-08 2012-05-29 Qualcomm Incorporated Methods and apparatus of enhanced coding in multi-user communication systems
KR100525799B1 (ko) * 2002-10-15 2005-11-03 국방과학연구소 주파수도약수열 발생장치
US7068703B2 (en) * 2003-02-18 2006-06-27 Qualcomm, Incorporated Frequency hop sequences for multi-band communication systems
US7411895B2 (en) * 2003-02-19 2008-08-12 Qualcomm Incorporated Controlled superposition coding in multi-user communication systems
JP3860556B2 (ja) 2003-04-04 2006-12-20 松下電器産業株式会社 基地局装置及び通信方法
US8593932B2 (en) * 2003-05-16 2013-11-26 Qualcomm Incorporated Efficient signal transmission methods and apparatus using a shared transmission resource
US7925291B2 (en) * 2003-08-13 2011-04-12 Qualcomm Incorporated User specific downlink power control channel Q-bit
US7039370B2 (en) 2003-10-16 2006-05-02 Flarion Technologies, Inc. Methods and apparatus of providing transmit and/or receive diversity with multiple antennas in wireless communication systems
US8014781B2 (en) 2004-06-08 2011-09-06 Qualcomm Incorporated Intra-cell common reuse for a wireless communications system
US7263335B2 (en) 2004-07-19 2007-08-28 Purewave Networks, Inc. Multi-connection, non-simultaneous frequency diversity in radio communication systems
US7460839B2 (en) 2004-07-19 2008-12-02 Purewave Networks, Inc. Non-simultaneous frequency diversity in radio communication systems
US7379446B2 (en) 2004-10-14 2008-05-27 Qualcomm Incorporated Enhanced beacon signaling method and apparatus
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CN101047402B (zh) * 2006-03-28 2010-09-08 华为技术有限公司 通信控制方法/系统
US7564910B2 (en) * 2006-04-17 2009-07-21 Zoran Kostic Method and system for communications with reduced complexity receivers
CN101637051B (zh) 2007-01-11 2012-10-31 高通股份有限公司 在无线通信系统中使用dtx和drx
KR200452480Y1 (ko) * 2010-09-17 2011-02-28 박정숙 펜스용 결합구
CN107395251B (zh) * 2017-07-17 2019-07-02 电子科技大学 适用于多收发信机认知无线网络的跳频序列生成方法
GB201907409D0 (en) * 2019-05-24 2019-07-10 Airbus Defence & Space Ltd Method of assigning a bandwidth for radio communication

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Publication number Priority date Publication date Assignee Title
WO2004036833A2 (fr) * 2002-10-17 2004-04-29 Alereon, Inc. Procedes et ensembles de picoreseaux utilisant l'acces multiple par repartition en frequence
WO2004036833A3 (fr) * 2002-10-17 2004-08-12 Alereon Inc Procedes et ensembles de picoreseaux utilisant l'acces multiple par repartition en frequence
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US7853277B2 (en) 2002-10-17 2010-12-14 Alereon, Inc. Method and system of piconet groups

Also Published As

Publication number Publication date
EP2271023B1 (fr) 2013-01-16
EP2048809B1 (fr) 2011-07-06
EP1111834B1 (fr) 2009-04-15
ATE429095T1 (de) 2009-05-15
US6553019B1 (en) 2003-04-22
AU7229800A (en) 2001-06-28
EP2048809A1 (fr) 2009-04-15
JP2001230753A (ja) 2001-08-24
BRPI0006806B1 (pt) 2016-06-14
CA2327980A1 (fr) 2001-06-23
KR20010067478A (ko) 2001-07-12
ES2400127T3 (es) 2013-04-05
AU772662B2 (en) 2004-05-06
ES2366143T3 (es) 2011-10-17
ES2322537T3 (es) 2009-06-23
DE60042007D1 (de) 2009-05-28
BR0006806A (pt) 2001-07-24
KR100804920B1 (ko) 2008-02-20
CN1301089A (zh) 2001-06-27
CA2327980C (fr) 2007-02-13
CN1301089B (zh) 2011-12-07
EP2271023A1 (fr) 2011-01-05
ATE515851T1 (de) 2011-07-15
JP4593767B2 (ja) 2010-12-08
EP1111834A3 (fr) 2006-02-22

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